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Efectuati adunarile
a) -(-8/9)+2/3+(-5/3)
b) 11/7+(-6/7)+(-10/7)+(-2/7)
c)(-1/2)+(+1/2)+(-1/2)+(+1/2)+(-1/2)
d) (1/5)+(+1/5)+(-1/5)+(-1/5)